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Analog Devices Semiconductor Electronic Components Datasheet

AD22055 Datasheet

Single Supply Bridge Transducer Amplifier

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AD22055 pdf
a
FEATURES
Gain of 400. Alterable from 40 to 1000
Output Span 20 mV to (VS – 0.25) V
1 Pole Low-Pass Filtering Available
Offset Capability
Differential Input Resistance 230 k
Drives 1 kLoad to +4 V Using VS = +5 V
Supply Voltage: +3 V to +36 V
Transient Spike Protection and RFI Filters Included
Peak Input Voltage (40 ms): 60 V
Reversed Supply Protection: –34 V
Operating Temperature Range: –40؇C to +125؇C
APPLICATIONS
Interface for Pressure Transducers, Position
Indicator, Strain Gages and Other Low Level Signal
Sources
Single Supply Bridge
Transducer Amplifier
AD22055
FUNCTIONAL BLOCK DIAGRAM
+VS
6
AD22055
OFS
7
FILT
3
IN+ 8
IN– 1
A1
A2
5 OUT
2
GND
4 GAIN
GENERAL DESCRIPTION
The AD22055 accepts a differential signal from a bridge trans-
ducer whose common-mode signal can be anywhere between
the power supplies.
VREF
The extended temperature range allows for local signal condi-
tioning for oil and hydraulic pressure sensors as well as other
automotive sensors.
The use of an external gain resistor allows the user to compen-
sate transducer gain error and temperature drift.
+5 VOLT
OUTPUT
8765
IN+ OFS +VS OUT
AD22055
IN– GND FILT GAIN
1234
1k
GAIN = 400
ANALOG
GROUND
Figure 1. Typical Application Circuit for a Pressure Sensor Interface
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997


Analog Devices Semiconductor Electronic Components Datasheet

AD22055 Datasheet

Single Supply Bridge Transducer Amplifier

No Preview Available !

AD22055 pdf
AD22055–SPECIFICATIONS (@ TA = + 25؇C, VS = +5 V, VCM = 0, unless otherwise noted)
Parameter
Comments
Test Conditions
Min Typ Max Units
INPUTS (PINS 1 AND 8)
VCM
CMRRLF
CMRRHF
RINCM
RMATCH
RINDIFF
Common-Mode Range
Common-Mode Rejection Ratio f 10 Hz
Common-Mode Rejection Ratio f = 10 kHz
Common-Mode Input Resistance Pin 1 or Pin 8 to Pin 2
Matching of Input Resistances
Differential Input Resistance
Pin 1 to Pin 8
0
–80
–60
180
180
5V
–90 dB
–75 dB
230 k
± 0.5 %
230 300 k
PREAMPLIFIER
GCL
VO
RO
Closed-Loop Gain1
Output Voltage Range (Pin 3)
Output Resistance2
+0.02
77.6
40
80
V/V
+4.75 V
82.4 k
OUTPUT BUFFER
GCL
VO
RO
Closed-Loop Gain1
Output Voltage Range
Output Resistance (Pin 5)
RLOAD 10 k
VO 0.1 V dc
9.95
+0.02
10
2.0
10.05 V/V
+4.75 V
OVERALL SYSTEM
GCL
VOS
IOSC
BW–3 dB
SR
NSD
Gain1
Gain Drift
Gain Drift
Initial Offset Voltage3
Offset Drift
Offset Drift
Input Resistance
Short-Circuit Output Current
–3 dB Bandwidth
Slew Rate
Noise Spectral Density3
VO 0.1 V dc
–40°C to +125°C
–125°C to +150°C
–40°C to +125°C
–125°C to +150°C
Pin 7 to Pin 2
VO = + 1 V dc
f = 100 Hz to 10 kHz
398
–1
2.5
7
20
400
–60
–500
0.05
1
–10
3.0
11
30
0.2
0.2
402 V/V
ppm/°C
ppm/°C
1 mV
µV/°C
µV/°C
k
25 mA
kHz
V/µs
µV/Hz
POWER SUPPLY
VS
IS
Operating Range
Quiescent Supply Current4
TA = TMIN to TMAX
3
5 36 V
200 500 µA
TEMPERATURE RANGE
TOP Operating Temperature Range
–40 +125 °C
NOTES
1A2 gain is trimmed to ± 0.5% with a 0.01% 1 kresistor to ground from Pin 4. The overall gain is trimmed to a gain of 400 ± 0.5% with the same 1 kresistor. The
gain of A1 (the ratio of overall gain to A2 gain) is used to adjust the overall gain and, therefore, is not trimmed explicitly to 40. Note that the actual gain to a particu-
lar application can be modified by the use of an external resistor at Pin 4.
2The actual output resistance of A1 is only a few ohms, but access to this output, via Pin 3, is always through an 80 k resistor, which is trimmed to ± 3%.
3Referred to the input (Pins 1 and 8).
4With VDM = 0 V. Differential mode signals are referred to as VDM, while VCM refers to common-mode voltages.
All min and max specifications are guaranteed, although only those marked in boldface are tested on all production units at final test.
Specifications subject to change without notice.
–2– REV. 0


Part Number AD22055
Description Single Supply Bridge Transducer Amplifier
Maker Analog Devices
Total Page 4 Pages
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